Каким сканером вы его читаете P3807 Peugeot OBD2 may also be triggered by faults earlier down the line. For example, a dirty MAF sensor might be causing the car to overcompensate in its fuel-trim adjustments. As a result, oxygen sensors are likely to report fuel mixture problems.
возможно неправильное толкование с помощью сканера
прочитайте его с ACTIA